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4hv.org :: Forums :: General Chatting
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I think I just hit the HV-hobbyist jackpot...

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Jrz126
Fri Oct 12 2007, 09:27PM Print
Jrz126 Registered Member #242 Joined: Thu Feb 23 2006, 11:37PM
Location: Erie PA
Posts: 210
So we had a little clean up day at work today. We cleaned out the electronics lab and threw out a bunch of unused stuff.

I managed to set aside some stuff for myself:
14 doorknob style caps, 4uF 1500Vdc nom. 70A rms, 1100A peak repetitive.
4 SCR rectifiers 1400Vdc and 500A.
3 current transducers
a handfull of hocky puck SCRs

We're only about half way through throwing stuff out, so there is probably some other stuff I can get.

Now for the best part!
One of the main power electronics engineers was in the lab throwing out some stuff and I mentioned that I would like to get my hands on one of the big line filter caps used on the DC bus that feeds the traction motor inverters. He said that they are currently doing a supplier qualification test on 10 of them, and they will be junking them when finished. I think they're rated around 2700uF and 1400VDC nominal. They should be done with testing in a week or two.

Looks like I may be building a quarter shrinker as my next project :)




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Sulaiman
Fri Oct 12 2007, 10:22PM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
Nice cheesey

A couple of years ago I worked as an engineer for railway train maintenance
if those capacitors are dry film polypropylene types they're fantastic
- until they get hot !
We had a couple explode during a very hot (by uk standards) summer
They burst open a steel box (several mm thick steel)
Distorted steel cross-members
and blew the skirts off (panels that cover the ugly bits at the bottom of the train below floor-level.
Luckily no one got hurt.

So make absolutely certain that you don't let them get hot
Probably your Power Electronics guy will know more.
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Hazmatt_(The Underdog)
Fri Oct 12 2007, 11:14PM
Hazmatt_(The Underdog) Registered Member #135 Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Sounds like one hell of a coil gun is coming this way!
heheheh.
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Electroholic
Sat Oct 13 2007, 01:52AM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
4uf 1500V? they are probably low inductance film foil snubs for the switches, not ceramic doorknobs.
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Simon
Sat Oct 13 2007, 02:59AM
Simon Registered Member #32 Joined: Sat Feb 04 2006, 08:58AM
Location: Australia
Posts: 549
Great stuff. :) It's like Christmas when that happens. (Or "Geekmas" as someone said.)
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Tesladownunder
Tue Oct 16 2007, 04:20AM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Probably on a par with me finding a pile of 12 hockey puck SCR's in the dirt at our scrap metal place. Only cost a few bucks. Set up here and wired as a diode stack. Took 12kA before they blew at 15.

TDU
1192508375 10 FT32673 Cancrushscrbank Small
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